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Effect of moisture on the oxidation behaviour of ZrB2.

Naraparaju, Ravisankar and Maniya, Keyurbhai and Murchie, Alec and Fahrenholtz, W and Hilmas, Greg E (2020) Effect of moisture on the oxidation behaviour of ZrB2. Journal of the American Ceramic Society. Wiley. doi: 10.1111/jace.17500. ISSN 0002-7820.

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Abstract

Oxidation studies of ZrB2 were performed under wet air and dry air conditions at 1200, 1400 and 1500°C for 1, 4 and 10h. Compared to dry air, the presence of water vapor was found to enhance the oxidation kinetics by a factor of 7 to 30, depending on the temperature. Thermodynamic calculations suggested that water vapor promoted the formation of additional volatile species such as boric acid (HBO2), in addition to boria (B2O3) produced in dry air, which increased the evaporation rate of B2O3. Compared to dry air, the presence of water vapor leads to more rapid evaporation of boria and the transition from parabolic oxidation kinetic behavior (i.e., rate controlled by diffusion through boria) to linear (i.e., underlying ZrB2 is directly exposed to the oxidizing environment) at shorter times and lower temperatures.

Item URL in elib:https://elib.dlr.de/136595/
Document Type:Article
Title:Effect of moisture on the oxidation behaviour of ZrB2.
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Naraparaju, Ravisankarravisankar.naraparaju (at) dlr.dehttps://orcid.org/0000-0002-3944-1132
Maniya, KeyurbhaiKeyurbhai.Maniya (at) dlr.deUNSPECIFIED
Murchie, AlecUNSPECIFIEDUNSPECIFIED
Fahrenholtz, WUNSPECIFIEDUNSPECIFIED
Hilmas, Greg EUNSPECIFIEDUNSPECIFIED
Date:September 2020
Journal or Publication Title:Journal of the American Ceramic Society
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1111/jace.17500
Publisher:Wiley
ISSN:0002-7820
Status:Published
Keywords:Oxidation, ultra high temperature ceramics, zirconia
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:propulsion systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Turbine Technologies (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > High Temperature and Functional Coatings
Deposited By: Naraparaju, Dr Ravisankar
Deposited On:19 Oct 2020 10:17
Last Modified:15 Jul 2021 16:26

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